Grinding and refining mill.



H. L JOHNSTON.

GRINDING AND REHNING M'ILL.

APPLICATION FILED MAY 27. 1915.

1,166,597. Patented Jan.4, 1916.

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HERBERTL. JOHNSTON, OF TROY, OHIO, ASSIGNOR TO THE HOBART MANUFACTURINGCOMPANY, OF TROY, OHIO, A CORPORATION OF OHIO. I

GRINDING AND REFINING MILL.

To all whom it may concern Be it known that I, HERBERT L. JoHNsToN, acitizen of the United States, and a resident of the city of Troy, in thecounty of Miami and State of Ohio, have invented certain new and usefulImprovements in Grinding and Refining Mills, of which the following forthe finished cofiee, instead of secured to the air suction device, andthis object, with the attendant advantages to behereinafter mentioned,is accomplished by that certain construction and arrangement of parts tobe hereinafter more specifically pointed out and claimed.

In the drawings, Figure 1 is a side elevation of the grinder and refinerwith the blow fan and refining devices in section, Fig. 2

is a front elevation of the machine.

Mounted on the base 1 is the pedestal 2 for the driving motor 3. Thebase extends forwardly at 4 and forms a support for the receiving can 5.This can has a mouth 6 which is positioned on the end of the can'as itstands on the base portion l, when in'use. Also located in the sides ofthe can are a series of air apertures 7 the use of which will behereinafter mentioned.

Mounted on the motor is the grinder case 8- of the machine, which has ahopper 9 and proper burs and a wiper of any desired design. Mounted onthe bur or grinding case 8 is the casing 10 for the blower. The innerwall 11 of this casing has a journal for the blower fan shaft ,12, andthis inner wall forms 'a closure for the bur case already designated.The fan 13 is mounted on this V shaft 12 and driven by it, anddraws-aourrent of air up through an inlet 14in the said v Specificationof Letters Patent.

Patented Jan. 4, 1916 2 Application filed May 27, 1915. SerialNo.30,71'8. j

casing and forces it out through the outlet '15. The blower casing has aremovable'end plate 16 which journals the blower fan shaft.

It alsohas the adjusting screw 17 that adjusts theposition of the shaft12 for the purposes therein described. Said adjusting screw likewise hasthe operating arm 18 carrying the spring plunger 19; When the airdrawnup through :the blower casing is forced. out through the outlet 15 itpasses into a cyclone 20, wherein the dust and chaff will'be collectedas is familiar" in practice. The ground cofiee passes out of the burcase through an outlet fitting 21 which is suitably secured in the mouthof the bur case,and the chaff passes up into the blower through theinlet 14 therein. The passageways through which the coffee must fallwhile being subjected to a counter draft from the blower are located inthe receiving can 5 above men"- tioned, and the air for creating, thesuction draft is admitted to the can through the openings 7 7, and themouth 6 of the can.

Set into and suitably secured in any 'desired manner in'the top of thecan isasemifunnel shaped portionhaving the verticalwalled mouth 22, avertical wall 23 and asloping wall or deflector wall 2 L. This por tionis so placed that the cofiee when falling from the bur case will strikethe deflector wall 24, and fall toward the mouth 22. The suction fromthe blower will then draw away from the falling coffee all of the chafi,raising it up into'the blower casing.

Suitably mounted on the outside of the can around the upper end of thesemi-funnel shaped-portion isa neck'25 for fittin'gov'er the outlet ofthe bur case and registering with the inlet to the blower casing. Thisneck is a casting having a dividing wall 26 and formed so as to fit overthe outlet fitting 21 of the bur case and also to register with themouth of the blower casing.

- Insetting up the machine, the empty receiving can is put into placewiththe two portions of its neck in proper position as now described;the motor is caused to oper ateand coffee poured into the hopper 9. Thecoffee will then be ground and the ground coffee together with the chaffwill fall down against the deflector wall Qt and thence down through thepassageway in the semi-funnel shaped portion of the can. It will bethere opposed by the current of air generated by the fan, which willdraw upwardly the chaff into the blower case. Mounted in the mouth 1d ofthe blower case is a valve 27 operated by a handle 27 which can beadjusted to regulate the strength of the air current, or can be employedto shut off the air altogether when it is desired to use the machine asa grinder only. lVhen a grinding is completed, the can is removed andthe coffee poured out. At this time the can may be shaken up or tappedto cause the chaff, which may have collected in the passageways in thetop of the can, to fall off. The great difiiculty with combinationgrinders and refiners and with refiners of coffee in general is that theelectrically charged particles of chaff have a tendency to clog up theexhaust passageways and then fall after a large accumulation has takenplace, therebymixing up chaff with the cleaned coffee in the receivingvessel. The expedient of locating the exhaust passageways in the mouthof the receiving vessel enables the operator to surely and easily cleanthem out after the end of each operation, and is an improvement of nosmall importance in the art for this reason, as well as for the reasonthat this design practically insures that the operator will see thecollected chaff if there is any when he is pouring out a charge ofground coffee.

I Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is:

1. In a device of the character described, the combination with agrinding mechanism having an outlet, a suction mechanism having aninlet, said inlet and outlet being adjacent to each other, and areceiving can freely removable from said. device, said can having apassageway forming member therein to register with the outlet and inletof the said two mechanisms, for the purpose described.

2. In a device of the character described, the combination with agrindint mechanism having an outlet, a suction mechanism having aninlet, said inlet and outlet being ad jacent to each other, and areceiving can freely removable from said device, said can having apassageway forming member therein to register with the outlet and inletof the said two mechanisms, and a neck portion for said can to fit saidoutlet and inlet, for the purpose described.

3. In a device of the character described, the combination with agrinding mechanism having an outlet, a suction mechanism having aninlet, a receiving can, a neck portion for the can to fit said outletand inlet, and a passageway forming member in the can communicating withthe neck whereby the ground material will enter said can at one pointand be subjected to a current of air from the suction device at another.

a. In a'device of the character described, the combination with agrinding mechanism having an outlet, a suction mechanism having aninlet, a receiving can, a neck portion for the can to it said outlet andinlet, and a passageway forming member in the can communicating with theneck whereby the ground material will enter said can at one point and besubjected to a current of air from the suction device at another, saidcan having a series of apertures for the admission of air.

5. In a device of the character described, the combination with agrinding mechanism and a suction mechanism, an outlet and an inlet forthe two mechanisms respectively, a receiving can freely removable fromsaid device, means on the can for fitting the said inlet and outlet, anda passageway forming member in the can communicating with the neck, forthe purpose described.

6. In a device of the character described, the combination with agrinding mechanism having an outlet, a suction mechanism having aninlet, a valve in said inlet to regulate the suction, a receiving canfreely removable from said device, a neck portion for the can to fitsaid outlet and inlet, and a passageway forming member in the cancommunicating with the neck whereby the ground material will enter saidcan at one point and be subjected to a current of air from the suctiondevice at another.

7. In a device of the character described, the combination with agrinding mechanism having an outlet, a suction mechanism ha-ving aninlet, a valve in said inlet to regulate the suction, a receiving canfreely removable from said device, a neck portion forthe can to fit saidoutlet and inlet, and a passageway forming member in the cancommunicating with the neck whereby the ground material will enter saidcan at one point and be subjected to a current of air from the suctiondevice at another, said can having a series of apertures for theadmission of air.

8. In a device of the character described, the combination with agrinding mechanism and a suction mechanism, an outlet and an inlet forthe two mechanisms respectively, a valve in said inlet to regulate thesuction, a receiving can freely removable from said device, means on thecan for fitting the said inlet and outlet, and a passageway formingmember in the can communicating with the neck, for the purposedescribed.

9. In a device of the character described, the combination withagrinding mechanism and a suction mechanism, an outlet and an inlet forthe two mechanisms respectively, a receiving can freely removable fromsaid device, means on the can for fitting the said With the suctioninlet, for the purpose deinlet and outlet, and a passageway formingscribed. member in the can communicating With the neck, said memberhaving a deflecting sur- HERBERT JOHNSTON face located so as to receivethe ground ma- Witnesses:

terial as it falls from the grinding mecha- W. H. HARTLEY,

nism, and a Vertical conduit communicating R. MCKENZIE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

